Official forecasts from MetService and aligned models project a daily maximum of 13°C in Wellington on September 10, driven by persistent southerly winds, cloud cover, and showers suppressing daytime warming. Real-time observations through evening confirm temperatures peaking near this threshold, consistent with September climatology of 12–14°C highs and reinforcing the market-implied 100% consensus on 13°C. Trader positioning reflects high confidence in these authoritative measurements over alternative stations or minor model variations. Only an unexpected late-day spike or station-specific reading of 14°C could alter resolution, though current conditions make such shifts improbable.